Easy to use I2C Geiger counter board
For Dosimeter board with I2C (RadSens board) Arduino
I simply inserted CTC-5 tube that I already had, connected RadSens board to Wemos D1 Mini ESP32 with provided wires, created a simple sketch using RadSens1v2 library, uploaded it - and it all works and shows radiation level close to GMC-300E Plus device.
However I found RadSensBoard library easier to use (link below), and it also does not have some problems that RadSens1v2 library has - like writing 21 bytes to 19 bytes buffer.
https://github.com/vurdalakov/radsensboard
There is also a MicroPython library for Raspberry Pi Pico:
https://github.com/vurdalakov/mpy_radsensboard
